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<title>Problem 1631. -- [Usaco2007 Feb]Cow Party -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1631: [Usaco2007 Feb]Cow Party</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>223&nbsp;&nbsp;<span class=green>Solved: </span>165<br>[<a href='submitpage.php?id=1631'>Submit</a>][<a href='problemstatus.php?id=1631'>Status</a>][<a href='bbs.php?id=1631'>Discuss</a>]</center><h2>Description</h2><div class=content>N(1 ≤ N ≤ 1000)个农场中的每个农场都有一只奶牛去参加位于第X个农场的聚会.共有M (1 ≤ M ≤ 100,000)条单向的道路,每条道路连接一对农场.通过道路i会花费Ti (1 ≤ Ti ≤ 100)的时间. 

作为参加聚会的奶牛必须走到聚会的所在地(农场X).当聚会结束时,还要返回各自的农场.奶牛都是很懒的,她们想找出花费时间最少的路线.由于道路都是单向的,所有她们前往农场X的路线可能会不同于返程的路线. 

Of all the cows, what is the longest amount of time a cow must spend walking to the party and back? 对于所有参加聚会的奶牛,找出前往聚会和返程花费总时间最多的奶牛,输出这只奶牛花费的总时间. 


</div><h2>Input</h2><div class=content>第1行:三个用空格隔开的整数. 
第2行到第M+1行,每行三个用空格隔开的整数:Ai, Bi,以及Ti.表示一条道路的起点,终点和需要花费的时间. 


</div><h2>Output</h2><div class=content>唯一一行:一个整数: 所有参加聚会的奶牛中,需要花费总时间的最大值. 
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>4 8 2<br />
1 2 4<br />
1 3 2<br />
1 4 7<br />
2 1 1<br />
2 3 5<br />
3 1 2<br />
3 4 4<br />
4 2 3<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
10<br />
样例说明: <br />
<br />
共有4只奶牛参加聚会,有8条路,聚会位于第2个农场. <br />
<br />
第4只奶牛可以直接到聚会所在地(花费3时间),然后返程路线经过第1和第3个农场(花费7时间),总共10时间. <br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
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